I am having a similar problem. I ended up using "UI Browser" to determine the path to element. Here is what I have so far. As proof it is navigating properly in that window, I have included the line to click on the radio button "Scaled".
activate application "System Preferences"
tell application "System Events"
tell process "System Preferences"
click button "Displays" of scroll area 1 of window "System Preferences"
delay 2
# click radio button 2 of radio group 1 of group 1 of window 1
set value of value indicator 1 of slider 1 of group 1 of window 1 to 0.25
end tell
end tell
cucaracha
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